The level of environmental toxins such as DDT decreases as you move into the higher trophic levels
Indicate whether the statement is true or false
FALSE
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How can only four nucleotides account for the extreme diversity of traits within living things?
a. The biochemical structure of nucleotides differs between cell types. b. The nucleotides can base pair with any other nucleotide. c. Nucleotides are arranged in many different sequences. d. Different proteins can be encoded from the same DNA sequence. e. Complex organisms have more than four types of nucleotides.
In low-lying areas with poor drainage, ________ results in a black or bluish-gray soil with a high organic content
Fill in the blank(s) with correct word
The basic rhythm of the heartbeat is set by the ________
A) systolic pressure B) EKG C) sinoatrial node D) "fight-or-flight" hormone
Some plants obtain nitrogen from symbiotic fungi or bacteria.What was the original source of N for the bacteria?
a. urea in the soil b. N2 gas c. carbohydrates in the soil d. lipids in the soil e. proteins in the soil